In many enterprise and small business environments, Power over Ethernet (PoE) is the default method for powering Cisco IP phones. However, there are numerous scenarios where PoE isn't an option—legacy switches that don't support it, fully utilized PoE ports, or specific desk locations where running both data and power over a single cable isn't feasible. In these situations, a dedicated local power supply like the Cisco ADP-50GR B becomes essential. This guide provides a comprehensive overview of this adapter, its role within the Cisco Power Cube 4 ecosystem, and what to consider when deploying or replacing it.
This article is intended for IT administrators, network engineers, and procurement professionals who need to understand the specifications, compatibility, and use cases for the ADP-50GR B power adapter in their Cisco Unified Communications environments.
What Is the Cisco ADP-50GR B Power Adapter?
The Cisco ADP-50GR B is a 50-watt external AC/DC power adapter designed to provide local power to select Cisco IP phones. It converts standard AC wall power (100-240V, 50-60Hz) into a regulated 48V DC output at 1.042A. This adapter is a key component of Cisco's Power Cube 4 external power solution.
The adapter is manufactured by Delta Electronics for Cisco and carries the Cisco part number 341-100594-01. It's a compact, fanless unit designed for discreet placement near a workstation.
The Role of the Power Cube 4 System
The ADP-50GR B is not a standalone unit; it's part of the Cisco Power Cube 4 power supply system. This system is specifically designed to power IP phones when PoE is unavailable. The Power Cube 4 supports up to 44W of power output, which is sufficient for the operation of high-end desk phones.
A critical detail for deployment is that the Power Cube 4 adapter uses a specialized power switch cable. This cable connects the power adapter to the phone's DC adapter port. This cable is specifically designed to work with the 341-100594-01 adapter and above. If you're replacing a lost or damaged adapter, it's essential to ensure you have the correct power switch cable, as a standard power cord may not be compatible.
Compatible Cisco IP Phone Models
The ADP-50GR B / 341-100594-01 adapter is designed for use with specific Cisco IP phone series. Based on multiple sources, its primary compatibility includes:
Cisco 8800 Series:
- 8811
- 8831
- 8841
- 8845
- 8851
- 8861
- 8865
Cisco 8900 Series:
- 8941, 8945
- 8961
Cisco 9900 Series:
- 9951
- 9971
Some sources also indicate compatibility with the 8900 and 9900 series generally. The adapter is part of the Power Cube 4 system, which is the official local power solution for these phone models.
Important Note: While the ADP-50GR B is the OEM adapter for these models, some third-party replacements may have slightly different specifications, such as a 44W (48V, 0.917A) output. Always verify that the specifications of any replacement adapter match the requirements of your specific phone model.
OEM vs. Compatible Replacements
When sourcing a replacement for the ADP-50GR B, you have two primary options: an OEM (Original Equipment Manufacturer) unit or a compatible third-party adapter.
OEM Replacement: An OEM adapter, like another ADP-50GR B or one of its equivalent part numbers, is manufactured to Cisco's exact specifications. It guarantees the correct 48V, 1.042A output and is designed to work seamlessly with the Power Cube 4 system. The ADP-50GR B itself is an OEM product manufactured by Delta Electronics. Known equivalent part numbers include:
- Cisco 341-0330-01 A0
- Cisco 341-100594-01 A0
- Cisco 341-100594-02
- Cisco ADP-50GRB LB PS
- Cisco EADP-48EB B
- 340-0330-02
Compatible (Third-Party) Replacement: A compatible adapter is manufactured by a different company but designed to meet similar electrical specifications. These can be a cost-effective alternative. However, quality can vary. When considering a compatible replacement, look for:
- Exact Voltage: 48V DC. Using an adapter with a different voltage can damage the phone.
- Sufficient Current: At least 1.042A (or the phone's requirement, which may be lower, e.g., 0.917A for some models). A higher current rating is generally safe, as the device only draws what it needs.
- Correct Connector: The adapter must physically connect to the phone's DC input port via the Power Cube 4 power switch cable.
- Safety Certifications: Look for certifications like UL, CE, or FCC, which indicate the product has been tested for safety.
Common Scenarios and Troubleshooting
Understanding common issues can help quickly resolve power-related problems with Cisco IP phones.
Phone Won't Power On:
- Check the Outlet: Ensure the wall outlet is functioning.
- Verify Connections: Confirm the AC power cord is securely connected to both the adapter and the wall outlet. Also, check that the power switch cable is firmly plugged into both the adapter and the phone's DC port.
- Test with a Known-Good Adapter: If available, try a different, compatible power adapter to determine if the issue is with the adapter or the phone itself.
- Inspect for Damage: Look for frayed cables, bent pins, or other physical damage to the adapter or cables.
Intermittent Power or Reboots:
- This can indicate a failing adapter that is no longer providing stable power. The adapter may work intermittently or fail under load.
- It could also be caused by a loose connection in the power switch cable or the phone's DC port.
Adapter Overheating:
- While some heat is normal, excessive heat—to the point where the adapter is uncomfortable to touch—is a sign of a problem. This could indicate internal component failure or that the adapter is being overloaded.
- Ensure the adapter is placed in a well-ventilated area and not covered by papers or other items.
When to Replace: Power adapters have a finite lifespan. Consider replacing the ADP-50GR B if you observe any of the following:
- Complete failure to power the phone.
- Intermittent power or random reboots.
- Excessive heat or a burning smell.
- Physical damage to the adapter or its cables.
- Unusual buzzing or clicking sounds from the adapter.
Frequently Asked Questions
Q: What are the exact specifications of the Cisco ADP-50GR B?
A: The ADP-50GR B outputs 48V DC at 1.042A, delivering 50W of power. It accepts 100-240V AC input at 1.3A.
Q: What is the Cisco part number for this adapter?
A: The primary Cisco part number is 341-100594-01.
Q: Which Cisco IP phones are compatible with the ADP-50GR B?
A: It is compatible with select models from the Cisco 8800 Series (e.g., 8811, 8841, 8851, 8861), the 8900 Series (e.g., 8961), and the 9900 Series (e.g., 9951, 9971).
Q: Is the ADP-50GR B the same as the Power Cube 4?
A: The ADP-50GR B is the power adapter component of the Cisco Power Cube 4 system. The Power Cube 4 also includes a specialized power switch cable that connects the adapter to the phone.
Q: Can I use this adapter with any Cisco IP phone?
A: No. It is specifically designed for the 8800, 8900, and 9900 series phones that use the Power Cube 4 system. Other Cisco phones may have different power requirements.
Q: Do I need this adapter if my switch supports PoE?
A: No. If your network switch provides Power over Ethernet (PoE), the phone will receive power through the Ethernet cable, and an external adapter like the ADP-50GR B is not required.
Q: What is the power switch cable, and why is it important?
A: The power switch cable is a specialized cable that connects the ADP-50GR B adapter to the phone's DC port. It is specifically designed to work with this adapter and is a required part of the Power Cube 4 system.
Q: Can I use a third-party replacement for this adapter?
A: Yes, but it's crucial to verify that the replacement matches the exact specifications (48V, at least 1.042A) and has the correct connector and safety certifications. However, for guaranteed compatibility, an OEM unit is recommended.
Q: How long does this adapter typically last?
A: With normal use in an office environment, most power adapters last 3 to 5 years. Factors like heat, physical stress on the cables, and power surges can shorten this lifespan.
Q: My phone is on but keeps rebooting. Could the adapter be the cause?
A: Yes. A failing adapter that can't provide stable power can cause a phone to intermittently lose power and reboot. Testing with a known-good adapter is a reliable way to diagnose this.
If you're looking for a compatible replacement for the Cisco ADP-50GR B power adapter, you may also be interested in our related power adapter guides and replacement products for Cisco IP phones and Power Cube 4 systems.
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